| 21. | A 13-bit address bus, as illustrated here, is suitable for a device up to 128 Mbit.
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| 22. | The address bus was 16-bits wide in the initial implementation and later extended to 24-bits wide.
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| 23. | Bank switching can be considered as a way of extending the address bus of a processor with some external register.
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| 24. | Combined with the two address bus sizes this meant that the chip was offered in a total of four versions:
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| 25. | Again the restrictions of the 16 bit address bus still meant memory banking was a necessity for memory greedy applications.
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| 26. | The 6800 had a three-state control that would disable the address bus to allow another device direct memory access.
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| 27. | If I have n wires in my address bus, I can address up to 2 ^ n chunks of memory.
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| 28. | Also, there were not enough pins available on a low cost 40-pin package for the additional four address bus pins
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| 29. | It was an 8-bit CPU with an external 14-bit address bus that could address 16 KB of memory.
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| 30. | The original 68000 ( introduced in 1979 ) had a 24-bit address bus and a 16-bit data bus.
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